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ServerCapabilities/AggregateFunctions (i=2997) is Part 5's list of every aggregate the server supports, and live AggregateFilter subscriptions still compute all 37 SDK aggregates, so it keeps the SDK's full set; only i=11201 follows the backend. A null SupportedAggregates is treated as the interface default (all) by both the advertisement and HistoryRead-Processed (it used to NRE inside the batch). Docs: i=2997/i=11201 split and the boot window. Co-Authored-By: Claude <noreply@anthropic.com>